diff --git a/_config/sql/update-tables.sql b/_config/sql/update-tables.sql
index f0a00f3c0..e69de29bb 100644
--- a/_config/sql/update-tables.sql
+++ b/_config/sql/update-tables.sql
@@ -1,41 +0,0 @@
--- ========================================
--- adapay_direct_key_config 直连密钥配置结构调整
--- 开发阶段: Adapay 商户身份由 app_id + apiKey + RSA 私钥承载
--- 无需独立商户号字段, 移除 merchant_no; 新增 sandbox 沙箱环境列与唯一索引
--- ========================================
-
--- 1. 删除 Adapay 商户号列(身份由 app_id 承载; 该列旧版仅存商户身份快照, 直接删除)
-ALTER TABLE "public"."adapay_direct_key_config" DROP COLUMN IF EXISTS "merchant_no";
-
--- 2. 新增沙箱环境列(默认非沙箱, 双环境并存: 同一通道商户同一环境密钥唯一)
-ALTER TABLE "public"."adapay_direct_key_config" ADD COLUMN IF NOT EXISTS "sandbox" bool DEFAULT false;
-COMMENT ON COLUMN "public"."adapay_direct_key_config"."sandbox" IS '是否沙箱环境';
-
--- 3. 唯一索引: 同一通道商户同一环境密钥唯一(存量数据存在重复时建索引会失败, 需先清理)
-CREATE UNIQUE INDEX IF NOT EXISTS "uk_adapay_direct_key_config_sandbox" ON "public"."adapay_direct_key_config" USING btree (
-  "channel_mch_no" "pg_catalog"."text_ops" ASC NULLS LAST,
-  "sandbox" "pg_catalog"."bool_ops" ASC NULLS LAST
-) WHERE deleted = false;
-COMMENT ON INDEX "public"."uk_adapay_direct_key_config_sandbox" IS '同一通道商户同一环境密钥唯一';
-
--- ===== pay_trade 增加支付通道冗余字段 =====
--- 冗余自容器 product→channel, 用于按接入通道维度看资金/报表免 JOIN; 与 pay_transfer_trade 口径对齐
-ALTER TABLE "public"."pay_trade" ADD COLUMN "channel" varchar(32) COLLATE "pg_catalog"."default";
-COMMENT ON COLUMN "public"."pay_trade"."channel" IS '支付通道(冗余自容器 product→channel; 创建即终值; 权威在容器 channel)';
-
--- 存量数据回填: 从业务容器反向填充 channel
--- 普通支付容器(normal)
-UPDATE "public"."pay_trade" t
-SET "channel" = c."channel"
-FROM "public"."pay_normal_order" c
-WHERE t."container_id" = c."id"
-  AND t."trade_type" = 'normal'
-  AND t."channel" IS NULL;
-
--- 网关支付容器(gateway)
-UPDATE "public"."pay_trade" t
-SET "channel" = c."channel"
-FROM "public"."pay_gateway_order" c
-WHERE t."container_id" = c."id"
-  AND t."trade_type" = 'gateway'
-  AND t."channel" IS NULL;
diff --git a/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/dao/region/CityAdjacentManager.java b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/dao/region/CityAdjacentManager.java
new file mode 100644
index 000000000..8ee7460c0
--- /dev/null
+++ b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/dao/region/CityAdjacentManager.java
@@ -0,0 +1,14 @@
+package cn.daxpay.open.platform.system.dao.region;
+
+import cn.daxpay.open.platform.common.mybatisplus.impl.BaseManager;
+import cn.daxpay.open.platform.system.entity.region.CityAdjacent;
+import org.springframework.stereotype.Repository;
+
+/// # 城市接壤关系
+///
+/// 纯关系表(无审计列), 仅供地理围栏 balanced 策略邻市容错查询;
+/// 数据由 update-datas.sql 脚本机器生成导入, 运行期仅提供读取能力。
+@Repository
+public class CityAdjacentManager extends BaseManager<CityAdjacentMapper, CityAdjacent> {
+
+}
diff --git a/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/dao/region/CityAdjacentMapper.java b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/dao/region/CityAdjacentMapper.java
new file mode 100644
index 000000000..2f9277a50
--- /dev/null
+++ b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/dao/region/CityAdjacentMapper.java
@@ -0,0 +1,13 @@
+package cn.daxpay.open.platform.system.dao.region;
+
+import cn.daxpay.open.platform.system.entity.region.CityAdjacent;
+import com.github.yulichang.base.MPJBaseMapper;
+import org.apache.ibatis.annotations.Mapper;
+
+/// # 城市接壤关系
+///
+/// 纯关系表(无审计列), 仅供地理围栏 balanced 策略邻市容错查询。
+@Mapper
+public interface CityAdjacentMapper extends MPJBaseMapper<CityAdjacent> {
+
+}
diff --git a/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/entity/region/CityAdjacent.java b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/entity/region/CityAdjacent.java
new file mode 100644
index 000000000..fce47c486
--- /dev/null
+++ b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/entity/region/CityAdjacent.java
@@ -0,0 +1,26 @@
+package cn.daxpay.open.platform.system.entity.region;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+/// # 城市接壤关系
+///
+/// 纯关系载体, 供地理围栏 balanced 策略邻市容错查询。
+/// 该表为机器生成的纯导入型字典表(约2000行静态数据, 双向存储), id 用 [IdType#AUTO] 走 DB 自增(bigserial),
+/// 不走应用层雪花; 无审计列。
+@Data
+@TableName("base_city_adjacent")
+public class CityAdjacent {
+
+    /// 主键ID(DB 自增, 纯关系表数据导入专用)
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /// 城市编码
+    private String cityCode;
+
+    /// 相邻城市编码
+    private String adjacentCityCode;
+}
diff --git a/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/service/region/ChinaRegionAdjacencyService.java b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/service/region/ChinaRegionAdjacencyService.java
new file mode 100644
index 000000000..c1db15240
--- /dev/null
+++ b/daxpay-platform/daxpay-platform-service/service-system/src/main/java/cn/daxpay/open/platform/system/service/region/ChinaRegionAdjacencyService.java
@@ -0,0 +1,65 @@
+package cn.daxpay.open.platform.system.service.region;
+
+import cn.daxpay.open.platform.system.dao.region.CityAdjacentManager;
+import cn.daxpay.open.platform.system.entity.region.CityAdjacent;
+import cn.hutool.core.util.StrUtil;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Service;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+/// # 城市接壤关系服务
+///
+/// 启动后首次访问时一次性把全量接壤关系载入内存(约千级行, 静态数据), 构建城市编码 → 邻市编码集合的多重映射,
+/// 供地理围栏 balanced 策略查询邻市。行政数据稳定, 无需运行期失效。
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class ChinaRegionAdjacencyService {
+
+    private final CityAdjacentManager cityAdjacentManager;
+
+    /// 接壤关系多重映射(惰性加载, 一经加载不再变更)
+    private volatile Map<String, Set<String>> adjacencyMap;
+
+    /// 查询指定城市的所有接壤邻市编码
+    ///
+    /// @param cityCode 城市编码(base_city.code, 4位)
+    /// @return 邻市编码集合, 无记录返回空集
+    public Set<String> findAdjacentCityCodes(String cityCode) {
+        if (StrUtil.isBlank(cityCode)) {
+            return Set.of();
+        }
+        return getAdjacencyMap().getOrDefault(cityCode, Set.of());
+    }
+
+    /// 惰性加载全量接壤关系并构建多重映射(双重检查锁定)
+    private Map<String, Set<String>> getAdjacencyMap() {
+        Map<String, Set<String>> local = this.adjacencyMap;
+        if (local != null) {
+            return local;
+        }
+        synchronized (this) {
+            if (this.adjacencyMap != null) {
+                return this.adjacencyMap;
+            }
+            long start = System.currentTimeMillis();
+            Map<String, Set<String>> map = new HashMap<>();
+            for (CityAdjacent row : cityAdjacentManager.findAll()) {
+                // 双向插入: 数据源可能只存单方向(a,b), 内存映射同时建 a→b 与 b→a,
+                // 使 findAdjacentCityCodes(cityCode) 对任意一端查询都返回完整邻市集合
+                map.computeIfAbsent(row.getCityCode(), k -> new HashSet<>()).add(row.getAdjacentCityCode());
+                map.computeIfAbsent(row.getAdjacentCityCode(), k -> new HashSet<>()).add(row.getCityCode());
+            }
+            this.adjacencyMap = map;
+            log.info("城市接壤关系载入完成: {} 条邻接记录, {} 个城市, 耗时 {}ms",
+                    map.values().stream().mapToInt(Set::size).sum(),
+                    map.size(), System.currentTimeMillis() - start);
+            return map;
+        }
+    }
+}